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I can't say where your breakers may be, different models have the panel in different places. But under the bed seems a common place for the Ford-based Class C units. Once you locate the panel there likely will be 110-volt breakers on one side and 12-volt fuses on the other. One of the breakers should be noted as "Water heater" or some abbreviation thereof.
I have a 10-gallon Atwood XT and there is one thermostat for both the gas heat side and the electric. So on my unit (at least) the water is heated to the same temperature regardless of the heat source, the water heater's electronic module will control both the gas burner and the relay that turns on/off the electric element. There also is a separate thermal cut-off safety should the main thermostatic switch "stick closed" and try to heat the water too hot. Also know heating it with electric will take far longer to come up to temperature than by burning propane. Are you giving it several hours to heat?
If you don't have an Atwood yours may work in a different manner and the problem could be something else completely. Or as mentioned earlier by another member if something has happened to the electric element itself it may not heat properly. Running on electric for any time with the tank empty will cause the element to fail.
Although not as likely, you could have a 110-volt wiring issue that may be causing an issue, there have been cases discussed here on the forum where owners found loose connections in the breaker panel and elsewhere. A poor connection may cause poor heating performance.
Can you tell us what type of hot water heater you have? Maybe we can better troubleshoot it with you if we knew the model.
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Rob R.
Akron, OH
2014 Seneca 37TS
Toads: 2019 Ford Edge ST or 2013 Ford Focus ST
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